Automatic take-up device



F. JERDONE AUTOMATIC TAKE-UP DEVICE.

APPLICATION FILED FEB.24, 1919- F. JERDONE, JR.

AUTOMATIC TAKE-UP DEVICE. APPLICATION FILED FEB. 24, 1919.

L L778, Patented. July 4;, 1922 2 SHEETS-SHEET 2- I N V EN TOR. i/rao/ye J:

A TTORNEY uurran earaur (DFFIQEO FRANCIS JERDONE, JR., OF TOLEDO, OHIO,ASSIGNOR TO THE WILLYS-OVERLAND COMPANY, OF TOLEDO, OHIO, A CORPORATIONOF OHIO.

AUTOMATIC TAKE-UP DEVICE.

Specification of Letters Patent.

Patented July 4:, IOZ2,

Application filed. February 24, 1919. Serial No. 278,769.

T 0 all w homit may concern Be it known that I, FRANCIS JERDONE, Jr., acitizen of the United States, residingiat Toledo, in the county of Lucasand State of Ohio, have invented certain new and useful Improvements inAutomatic Take-Up Devices, of which I declare the following to be afull, clear, and exact description.

My invention relates to an automatic take-up device, and has for itsobject to provide improved means adapted to compensate for lost motionbetween two or more co-operating members or mechanisms.

Another object of the invention is to provide a simple and inexpensiveautomatic take-up device, which is particularly adapted to compensatefor lost motion between the valves and cam shaft of an internalcombustion engine,'such as is used on motor vehicles.

Another object of the invention is to provide two or morereciprocallymounted members, one of which is of tubular construction, inwhich is mounted means for automatically effecting movement of one ofsaid members with respect to the other to compensate for lost motionbetween the several parts of the mechanism.

To these and other ends the invention comprises certain novel'featuresof construction and arrangement of parts, as will be hereinafter morefully described and claimed it being understood that the inveution issusceptible to certain modifications not shown in the drawing, whichwill be comprehended by the appended claims.

A structure constituting one embodiment of my invention is illustratedin the accompanying drawings forming a part of this specification, inwhich:

Figure I is a. fragmentary-sectional elevation showing the applicationof my invention as applied between the valves and cam-shaft of aninternal combustion engine.

Figure II is an enlarged detail side elevation of the push rod shown inFigure I.

Figure III is a top plan view of same.

Figure IV is a sectional plan taken on lines IV--IV of Figure II.

Figure V is a detailed-perspective view of the cam operating membershown in section in Figure I.

Figure VI is a fragmentary-sectional elevation illustrating a slightlymodified form of the invention.

Figure VII is a top-plan View of the push rod shown in Figure VI.

Figure VIII is a fragmentary, sectional elevation of anothermodification of the invention.

Figure IX is a fragmentary, sectional elevation taken on line IX-IX ofFigure VIII.

, Figure X is a longitudinal section through the upper end of one of thepush rods with the cam and cam operating parts removed.

Figure XI is an enlarged detail plan of the cam operating member shownin Figure VIII, and Figure XII is a side elevation of the same.

Similar reference numerals refer to similar parts throughout the severalviews of the drawing.

The automatic takeup device shown and described in the presentapplication as a compensating means for lost motion between the valvesand cam shaft of an internal combustion engine may readily be applied toother mechanisms where it is desired to provide compensating means forlost motion between an operating and operated member or members; itbeing understood that the present application is merely illustrative ofone of the uses to which the invention may be ,put.

Referring to the drawings 10 represents a portion of the cylinder blockor frame of an internal combustion engine, and 11 the cam shaft of theengine. The valves 12 are provided with the usual valve stems 13 throughthe lower ends of which are extended the pins 1% for supporting thespring sea (s15 carrying the lower ends of the valve closing springs 16,the upper e-ndsof said springs being held by the valve stem guides 17,which are preferably castintegral with the cylinder block. Seated uponthe earns 18 of the cam shaft 11 are the heads 19 of the push rods 20,which are reciprocably mounted in the ides 21 of the engine frame orblock 10. The push rod 20 is provided with a longitudinally extendingbore or recess 22, into which is screwed the threaded 'end 23 of thehead 19, as. shown in Figure I. The upper end of the push rod 20 isprovided with a transversely disposed wall which is recessed to receivethe cam 25, upon which is mounted the valve stem seat 0 ten-ding intoengagement with the lower of the valve stem 13. The cam 25 is preferablyelliptical or spheroidal in form, and is mounted within said recessedwall with its axis extending normally at a right angle to thelongitudinal axis of the valve stem, it being understood that the wall24 and seat 26 are curved to correspond with the curvature of the camwhen the latter is in the posit-ion shown in Figure I. In this figure itwill be seen that the cam projects slightly beyond thewall 24 at oneside thereof, and at this point it is engaged by the operating member27, shown in perspective in Figure V. The operating member 27 isprovided at its upper end and on its inner face with a recess 28, whichis curved to correspond to the curvature of the cam 25 at the endthereof. The upri ht portion of the cam operating member 2? normallylies in the opening 29 formed through the upper end wall of the push rod20, and the horizontal portion 30 of said operating member is extendedinto the recess 22 of the push rod and is seated upon the upper end of aspring 31, the lower end of which rests upon the extension 23 of thehead 19 of the push rod. The cam operating member 27 is held upon thespring 3,1 and in engagement with the cam 25 by means of the guide 21 inwhich the push rod and .operating member are slidably mounted. It willbe seen from this construction that the spring 31 serves toautomatically move the operating member for the purpose of rotating thecam 25 to compensate for lost motion between the valve and cam shaft ofthe eng In the modification shown in Figures VI and VII the parts aresubstantially the same as those already described with the exceptionthat the push rod 32 is made in one piece with the transverse wall 24omitted and the bore 33 extended entirely through the upper end of therod, the cam operating member 34 lying wholly within the bore andengaging the cam at a point nearer its center than in the arrangementshown in Figure I. In this modification the annular face of'the upperend of the push rod 82 is provided with acurved recess 34 as shown inFigure VII said recess being curved to correspond to the curvature ofthe cam 25.

In the modification shown in Figures VIII to XII inclusive, the push rod35 is similar to the push rod 32 shown in Figure VI, with the exceptionthat it is provided at its upper end with ,a longitudinally extendingslot or opening 36, in which the upright portion of the cam operatingmember 37 is mounted, the horizontal portion of said member being seatedupon the spring 31 in the bore 38 of the push rod, said operating memberbeing held against lateral displacement by means of the guide or bearing21 in which the push rod reciprocated. The upright portion of theoperating member 37 where it engages the cam is curved as indicated at40 to correspond to the curvature of the cam 41. The cam 41 ispreferably elliptical in form and is provided at its opposite sides withthe trunnions 42, which are rotatably mounted in curved recesses formedupon the spaced bearing portions 43 of the valve stem 13 which portionsare formed by slotting or recessing the valve stem as indicated at 44 inFigures VIII and IX. In this case the push rod 35 is recessed at pointsbeneath the trunnions 42 as indicated at 45 sufiiciently to prevent thecontacting of the trunnions with said push rod, this construction beingclearly shown in Figure IX. In this modification the cam operatingmember 37 is actuated by the spring 31 in the bore 38 of the push rodand said operating member is guided by the push rod bearing 21, and isconstantly acting upon the cam at one end thereof, tending to pivotallymove the same about the cam seating point- 46 on the push rod to eitherraise the trunnions 42 or depress the push rod to compensate for lostmotion between the valves and the cam shaft.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In an automatic take-up device, the combination with the valve stemand push rod of an internal combustion engine, a cam shaft for actuatingsaid parts, a cam between said valve stem and push rod, a spring carriedby the push rod within a recess formed therein, and a cam operatingmember disposed between said spring and cam for actuating the latter tocompensate for lost motion between the valve and cam shaft.

2. In an automatic take-up device, the

combination with the valve stem and push rod of an internal combustionengine, a cam shaft for operating said parts in one direction, a. springfor actuating said parts in an opposite direction, a. removable seat forthe free end of said valve stem, a cam disposed between said removableseat and the adjacent end of said push rod, a spring mounted within arecess formed in'said push rod, and an operating member disposed betweensaid spring and cam'for actuating the latter to automatically compensatefor lost motion between the valve and cam shaft.

3. In an automatic take-up device, the combination with the valves andpush rods of an internal combustion engine, means for actuating thesame, guides for said push rods and the stems of said valves, a cammounted between each of the valve stems and push rods, a. spring mounteda recess formed in each of said push rods and an operating member foreach of the cams interposed between the cam and spring and held againstdisplacement by said push red guide.

4. In an automatic take-up device, the

combination with the valve and valve stem of an internal combustionengine, a push rod provided with a recess, a cam seated upon within saidrecess for actuating the cam operatingrmember, and means for actuatingsaid push rod and valve stem.

5. In an automatic take-up device, the combination with the valves andvalve stems of an internal combustion engine, push rods provided withlongitudinal bores and having openings through their wallscommunieatingwith said bores, a cam seated upon the end of each of the push rodsnearest the valve stems and co-operating with the latter to actuate thesame, a spring mounted in each of said bores, a cam operating memberhaving angular portions, one of which extends lnto engagement with saidsprings and the other being disposed in the opening in the wall of thepush rod and co-operating with the cam to actuate the same, andmeans foractuating said. push rods and valve stems.

6. In an automatic take-up device, the combination with the exhaustvalves and valve stems of an internal combustion engine, a cam providedwith trunnions rotatably engaging said valve stem, a push rod for eachof said valve stems, means carried by said push rod for rotating saidcam upon its trunnions and pivotally moving it upon said seat and meansfor simultaneously actuating the push rod and valve stem independentlyof the operation of said cam.

7. In an automatic take-up device, the combination with the exhaustvalve and valve stem of an internal combustion engine, a rotatable camco-operating with the valve ing said members, a cam interposed betweenthe adjacent ends of said members and means mounted in said tubularmember for actuating said cam to compensate for lost motion between saidparts.

9. In an automatic take-up device, the combination with two or morer'eciprocably mounted members, one of which is of tubular construction,means for actuating said members, a cam rotatably mounted between saidmembers, a spring mounted in said tubular member, and an operatingmember for rotating said cam adapted to be actuated by said spring.

10. In an automatic take-up device, the combination with two or moremembers mounted for reciprocating movement, one of which is of tubularconstruction, guides for said members, means for reciprocating saidmembers within the guides, a cam rotatably mounted between said membersfor moving one relatively to the other, a spring in said tubular memberand an operating member for the cam seated upon said spring andextending through an opening in the wall of the tubular member insliding engagement with the guide for said tubular member.

11. An automatic take-up device comprising a tubular member, a springwithin said member, a follower arranged to be actuated by the spring anda floating cam having one end loosely engaging the wall of the tubularmember and t-heother disposed on the follower whereby upon expansion ofthe spring the cam will pivot about the end engaging said wall, saiddevice being insertable between two movably mounted parts, one of whichis adapted to seat upon the cam.

12. An automatic take-up device ,comprising a tubular member, a springanchored within said tubular member, a follower arranged to be actuatedby said spring, said tubular member and follower being provided withoppositely arranged concave portions and a cam having its opposite endsresting within said concave portions, the cam being adapted to pivotupon the tubular member when the follower is actuated by the spring,said device being insertable between two movable parts, one of which isadapted to seat upon the cam.

13. An automatic take-up device comprising two relatively movablemembers, one of which is spring actuated upon the other and a cam havingits opposite ends loosely resting upon said members, said device beinginsertable between two movably mounted parts, one of which is adapted tobe seated upon the cam.

14. An automatic take-up device comprising a tubular member having aslot in the open end thereof, a spring supported within said tubularmember, a follower seated upon said spring having a portion disposedwithin said slot and extending substantially to the end of the tubularmember and a cam having one end loosely resting upon the outer end ofthe follower and the other loosely engaging the tubular member wherebywhen the follower is moved outwardly the cam will pivot about the endresting upon said tubular member, said device being insertable betweentwo movable parts, one

of which is adapted to seat upon the cam. In testimony whereo 'I afiixmy signature.

FRANCIS J ERDONE, J a.

